Use SUBSTR
I tried this and it works.
Text File: (File Name LOAD_DATA.TXT)
1,99999999.99
2,99999999.99
3,99999999.99
4,99999999
5,99999999
6,99999999
7,99999999
8,99999999
9,99999999
10,99999999
CTL File:
LOAD DATA
INFILE 'LOAD_DATA.TXT'
INTO TABLE tbl_name
FIELDS TERMINATED BY ','...